CN2151582Y

CN2151582Y - Automatic switch

Info

Publication number: CN2151582Y
Application number: CN 92241229
Authority: CN
Inventors: 马希光
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-11-09
Filing date: 1992-11-09
Publication date: 1993-12-29
Anticipated expiration: 2002-11-09

Abstract

The utility model relates to an automatic switch, particularly a switch which is connected with a circuit comprising a photoresistor CDS and an SCR at both ends of a traditional switching circuit; the automatic switch causes the conduction and the interruption of the current of the circuit to be controlled by the change of luminance; namely, the circuit is switched off automatically, when light is sufficient; the circuit is switched on automatically, when the light is insufficient. When the switch of the utility model is pivoted with the two electrodes of a power supply, the utility model can has two output load via the photoresistor and an SCR circuit; the automatic switch has an identical switching function.

Description

Automatic switch

On the whole people all switch with switch with in the electric control, and in fact all devices with on/off (ON/OFF) function in the broadest sense, all belong to switch.

With light fixture, in some occasion, switch and lamp locker have a segment distance, and as the doorway lamp of villa, its switch may be located in the building or walk on the exterior feature, so as long as be the illuminating lamp on changeable doorway in building.

Another kind of situation is the extended line that people habitually practise, promptly, with a plug gang socket, this socket provides scarfing seat for the plug of another electrical equipment again, this situation is common in the supply socket on the indoor wall and the situation of light fixture ornaments place apart from each other, this socket that prolongs the wiring effect that plays is used for connecting circuit merely.

When power supply and light fixture not in same room, and (just do not use extended line) when utilizing extended line to connect because of the room that uses light fixture has socket, then its switch is located on the light fixture or is the plug of extended line itself, or the plug of light fixture, and when the user forgets to close the light fixture switch, then may form the meaningless phenomenon that expends of electric power.As if if this light fixture is the illumination of indispensability at night, or user's darkness is gone out and must be provided room lighting in case during the thief, then according to present device, be difficult to reach this function.

This case applicant has carried out research and experiment for many years at switch, the automatic switch of development cost application finally.

The purpose of this utility model is to provide a kind of automatic switch, promptly connect a circuit that comprises photo resistance CDS and silicon controlled rectifier SCR at the conventional switch circuit two ends, the control that makes the break-make of electric current changed by luminosity, automatic disconnection when bright and clear, automatic conducting during insufficient light is to overcome the shortcoming of conventional switch.

For further specifying concrete technology contents of the present utility model, see also accompanying drawing, wherein,

Fig. 1 is used for the schematic appearance of the utility model switch on the wall;

Fig. 2 is the profile schematic diagram that is used for the utility model automatic switch on the extended line socket;

Fig. 3 is the internal circuit diagram of the utility model switch;

Internal circuit diagram when Fig. 4 is used for extended line for the utility model switch.

As shown in the figure, basically, the utility model is at present switch ends connection circuit as shown in Figure 3, that is, link a photo resistance CDS-silicon controlled rectifier SCR therebetween, and outside the photoreceptor of photo resistance is exposed to, making it can be littler along with the bright more impedance of extraneous light, light resistance in the dark more is anti-big more.

So under normal brightness, A point voltage (by the internal driving dividing potential drop of R1 and CDS) deficiency is so that Zener diode ZD puncture, SCR is failure to actuate, and when the brightness deepening, the CDS impedance increases, the A point voltage improves, and when reaching the ZD breakdown point, triggers SCR simultaneously, and make the SCR conducting, make circuit be channel status, at this moment, light fixture through switch control is promptly luminous, therefore, as long as change resistance value or the ZD of R1, promptly be adjustable to suitable electric light brightness.

For overcoming the luminance shortage of light fixture, the application adds after the power supply input and puts the full-wave rectification circuit, and when reality was implemented, the two poles of the earth connect from power supply, and establishes two output loadings in addition.

Fig. 4 is the extended line situation, and when an end of extended line was borrowed the plug gang socket, then Ci Shi output was L1 and L2, for the electricity consumption of light fixture plug.

Its working condition is with aforementioned, is exposed to the outer wall of extended line socket as the light-receiving device with photo resistance CDS, and then the power supply supply of this extended line socket promptly changes with light and switches.

During enforcement, be that 110V and 220V are example according to present power supply, under the 110V situation, CDS changes between 0-5M Ω, and when R1=12K Ω 1/2W, then ZD1 is 4.7V, and when power supply was AC220V, then R1 was 33K Ω 1/2W, and ZD1 then is 12V.

So when switch was in connection circuit (unlatching) state, the break-make of its power supply depended on the change light situation of photo resistance, and need not manual operation switch, this is very practical to aforementioned occasion.

Claims

1, a kind of automatic switch, it is characterized in that: this switch ends is connected to a circuit that comprises photo resistance, SCR and rectifier, and outside the light-receiving device of this photo resistance is exposed to, so that switch the two poles of the earth, be off-state when making it bright and clear, be conducting state during insufficient light via the change in resistance of photo resistance.

2, automatic switch as claimed in claim 1 is characterized in that: described the two poles of the earth connect from power supply and establish two output loadings in addition.